An aluminium alloy rod has a length of 1.6m at a temperature of 35°C. Determine the increase in length that occurs when the rod is heated to a temperature of 145°C. The coefficient of linear expansion for Al alloy = 0.000022/°C.

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)